{"cve":"CVE-2020-26210","nvd":{"published":"2020-11-03T19:15:13.157","modified":"2026-06-17T03:07:49.733","status":"Modified","description":"In BookStack before version 0.30.4, a user with permissions to edit a page could add an attached link which would execute untrusted JavaScript code when clicked by a viewer of the page. Dangerous content may remain in the database after this update. If you think this could have been exploited the linked advisory provides a SQL query to test. As a workaround, page edit permissions could be limited to only those that are trusted until you can upgrade although this will not address existing exploitation of this vulnerability. The issue is fixed in version 0.30.4.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N","score":8.7},"cwes":["CWE-79"],"references":["https://bookstackapp.com/blog/beta-release-v0-30-4/","https://github.com/BookStackApp/BookStack/commit/349162ea139556b2d25e09e155cec84e21cc9227","https://github.com/BookStackApp/BookStack/releases/tag/v0.30.4","https://github.com/BookStackApp/BookStack/security/advisories/GHSA-7p2j-4h6p-cq3h","https://bookstackapp.com/blog/beta-release-v0-30-4/"],"products":["bookstackapp:bookstack"],"source":"nvd","synced_at":"2026-10-19T21:11:20.317016139+00:00"},"epss":{"cve":"CVE-2020-26210","score":0.01169,"percentile":0.67399,"date":"2026-11-01"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}